Gnu screen, using the exec command in .screenrc

I have added the following lines to my .screenrc
bind -c music u exec amixer sset Master,0 5+ >& /dev/null
bind -c music d exec amixer sset Master,0 5- >& /dev/null
bind -c music t exec amixer sset Master,0 toggle >& /dev/null
bind -c music k exec > /home/g/stop.n; pkill mpg123
bind -c music m exec . /home/g/newmusic.sh
bind -c music n exec pkill mpg123
bind -c music s exec . /mnt/1/setnewt.sh
bindkey "^y" command -c music # ^y [udt] for volume, [kmns] play/stop music
The first three work as expected, but ^yn, which should kill mpg123, instead kills the app in screen that I happen to be using when I press ^yn. How should I be writing it to have the effect I want?

I put them both in one try catch (Exception) method, but still no exception is catched, the return exit value is still 1, and not zero, the problem is I do not understand the significance of a return value of 1 is there a reference that can explain what a return value of 1 means compared to any other returns value.
Thanks
Sherif.

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